Use DL preferred alignment for alloca in Value::getPointerAlignment
Teach Value::getPointerAlignment that allocas with no explicit alignment are aligned to preferred alignment of the allocated type.
Reviewed By: hfinkel
Differential Revision: http://reviews.llvm.org/D17569
llvm-svn: 267689
diff --git a/llvm/lib/IR/Value.cpp b/llvm/lib/IR/Value.cpp
index cc20c48..08b4936 100644
--- a/llvm/lib/IR/Value.cpp
+++ b/llvm/lib/IR/Value.cpp
@@ -554,9 +554,14 @@
if (EltTy->isSized())
Align = DL.getABITypeAlignment(EltTy);
}
- } else if (const AllocaInst *AI = dyn_cast<AllocaInst>(this))
+ } else if (const AllocaInst *AI = dyn_cast<AllocaInst>(this)) {
Align = AI->getAlignment();
- else if (auto CS = ImmutableCallSite(this))
+ if (Align == 0) {
+ Type *AllocatedType = AI->getAllocatedType();
+ if (AllocatedType->isSized())
+ Align = DL.getPrefTypeAlignment(AllocatedType);
+ }
+ } else if (auto CS = ImmutableCallSite(this))
Align = CS.getAttributes().getParamAlignment(AttributeSet::ReturnIndex);
else if (const LoadInst *LI = dyn_cast<LoadInst>(this))
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_align)) {